我想设置一个UILabel的左插图/边距,但找不到这样做的方法。标签有一个背景集,所以仅仅改变它的原点是行不通的。这将是理想的插入文本10px左右在左手边。
当前回答
为UILabel添加填充的最佳方法是子类化UILabel并添加一个edgeInsets属性。然后设置所需的插图,标签将相应地绘制。
OSLabel.h
#import <UIKit/UIKit.h>
@interface OSLabel : UILabel
@property (nonatomic, assign) UIEdgeInsets edgeInsets;
@end
OSLabel.m
#import "OSLabel.h"
@implementation OSLabel
- (id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
self.edgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
}
return self;
}
- (void)drawTextInRect:(CGRect)rect {
[super drawTextInRect:UIEdgeInsetsInsetRect(rect, self.edgeInsets)];
}
- (CGSize)intrinsicContentSize
{
CGSize size = [super intrinsicContentSize];
size.width += self.edgeInsets.left + self.edgeInsets.right;
size.height += self.edgeInsets.top + self.edgeInsets.bottom;
return size;
}
@end
其他回答
要扩展Brody Robertson提供的答案,您可以添加IB可设计位。这意味着您可以在Storyboard中调整标签。
在你的子类UILabel做
#import <UIKit/UIKit.h>
IB_DESIGNABLE
@interface insetLabel : UILabel
@property (nonatomic, assign) IBInspectable CGFloat leftEdge;
@property (nonatomic, assign) IBInspectable CGFloat rightEdge;
@property (nonatomic, assign) IBInspectable CGFloat topEdge;
@property (nonatomic, assign) IBInspectable CGFloat bottomEdge;
@property (nonatomic, assign) UIEdgeInsets edgeInsets;
@end
然后做;
#import "insetLabel.h"
@implementation insetLabel
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
self.edgeInsets = UIEdgeInsetsMake(self.topEdge, self.leftEdge, self.bottomEdge, self.rightEdge);
}
return self;
}
- (void)drawTextInRect:(CGRect)rect
{
self.edgeInsets = UIEdgeInsetsMake(self.topEdge, self.leftEdge, self.bottomEdge, self.rightEdge);
[super drawTextInRect:UIEdgeInsetsInsetRect(rect, self.edgeInsets)];
}
- (CGSize)intrinsicContentSize
{
CGSize size = [super intrinsicContentSize];
size.width += self.edgeInsets.left + self.edgeInsets.right;
size.height += self.edgeInsets.top + self.edgeInsets.bottom;
return size;
}
@end
EDIT
你应该为edgeInsets添加一个setter方法。
我认为UILabel类没有设置边距的方法。为什么不把标签的位置设置在需要的位置?
见下面的代码:
UILabel *label = [[UILabel alloc] init];
label.text = @"This is label";
label.frame = CGRectMake(0,0,100,100);
如果来自接口构建器,则按以下方式定位Label:
yourLabel.frame = CGRectMake(0,0,100,100);
Swift 3 &自动布局兼容版本:
class InsetLabel: UILabel {
var insets = UIEdgeInsets()
convenience init(insets: UIEdgeInsets) {
self.init(frame: CGRect.zero)
self.insets = insets
}
convenience init(dx: CGFloat, dy: CGFloat) {
let insets = UIEdgeInsets(top: dy, left: dx, bottom: dy, right: dx)
self.init(insets: insets)
}
override func drawText(in rect: CGRect) {
super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}
override var intrinsicContentSize: CGSize {
var size = super.intrinsicContentSize
size.width += insets.left + insets.right
size.height += insets.top + insets.bottom
return size
}
}
你需要计算UILabel大小,当你放置嵌入。它可以有不同的行数,因为文本对齐,换行模式。
override func drawText(in rect: CGRect) {
let size = self.sizeThatFits(UIEdgeInsetsInsetRect(rect, insets).size);
super.drawText(in: CGRect.init(origin: CGPoint.init(x: insets.left, y: insets.top), size: size));
}
override var intrinsicContentSize: CGSize {
var size = super.intrinsicContentSize;
if text == nil || text?.count == 0 {
return size;
}
size = self.sizeThatFits(UIEdgeInsetsInsetRect(CGRect.init(origin: CGPoint.zero, size: size), insets).size);
size.width += self.insets.left + self.insets.right;
size.height += self.insets.top + self.insets.bottom;
return size;
}
尝试 iEun/InsetLabel
blyabtroi的asnwer在Swift中转换(不需要子类化)
let style: NSMutableParagraphStyle = NSParagraphStyle.defaultParagraphStyle().mutableCopy() as! NSMutableParagraphStyle
style.alignment = .Justified
style.firstLineHeadIndent = 10.0
style.headIndent = 10.0
style.tailIndent = -10.0
let attrText: NSAttributedString = NSAttributedString(string: title, attributes: [NSParagraphStyleAttributeName:style])
let label: UILabel = UILabel(frame: someFrame)
label.numberOfLines = 0
label.attributedText = attrText
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